noun
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the act or process of extruding
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the movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock
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any igneous rock formed in this way
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a component or length of material formed by the process of extruding
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The emission of lava onto the surface of the Earth.
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◆ Rocks that form from the cooling of lava are generally fine-grained (because they cool quickly, before large crystals can grow) and are called extrusive rocks.
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Compare intrusion
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The process of making a shaped object, such as a rod or tube, by forcing a material into a mold.
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
Origin of extrusion
1530–40; < Medieval Latin extrūsiōn- (stem of extrūsiō ), equivalent to Latin extrūs ( us ) (past participle of extrūdere to extrude ) + -iōn- -ion
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
That equates to 48 downstream U.S. jobs for every one job at a smelter — and that includes more than 170 extrusion plants in 36 states.
From MarketWatch ● Aug. 31, 2026
U.S. smelting has declined under high energy costs, and there has also been chronic underinvestment in rolling, extrusion and finishing, he added.
From The Wall Street Journal ● Oct. 10, 2025
In order to mimic this structure, manufacturers use processes such as stretching, kneading, folding, layering, 3D printing and extrusion.
From Salon ● Nov. 25, 2024
Dekker provided the first demonstration of this loop extrusion predicted by Mirny, collaborated on synthetic cells with Schwille, and developed new ways to use nanopores—holes or membranes of nanometer size—to sequence DNA and proteins.
From Science Magazine ● Jun. 6, 2024
Every fresh outburst of volcanic force, and every fresh extrusion of lava, tends to disturb it, and to alter the relations of the interior viscous or molten magmas.
From Volcanoes: Past and Present by Edward Hull
Because bronchoconstriction causes so many cell extrusions, it damages the airway barrier which causes inflammation and excess mucus.
From Science Daily ● Apr. 4, 2024
For example, Mount St. Helens’ eruption that began in 2004 taught scientists that dome growth — or lava extrusions — can occur after long periods of inactivity without obvious signals.
From Seattle Times ● Nov. 7, 2023
“Aluminum extrusions, historically from Russia, are just not available, or available after many months at astronomical prices.”
From Washington Times ● Apr. 3, 2023
Aluminum extrusions are subject to high anti-dumping and countervailing duties, put into effect in 2011, while finished aluminum products such as pallets are not.
From Los Angeles Times ● Apr. 12, 2022
In the center of the hall a troupe of musicians pluck their fleshy instruments, the cartilaginous extrusions from their caved-in bellies thrumming to a familiar tune.
From Salon ● Jun. 8, 2019
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
